Opportunity
The manipulation of microagents, microrobots, or microparticles is critical in industrial and biomedical applications, such as targeted drug delivery, minimally invasive surgery, and precision manufacturing. However, existing electromagnetic systems face significant limitations, including insufficient magnetic field strength, poor gradient control, and restricted workspace size. These shortcomings reduce the efficiency and applicability of magnetic-based manipulation, particularly in environments requiring high precision or large-scale operation, such as in vivo medical procedures or industrial microassembly. The inability to dynamically adjust the workspace or optimize magnetic gradients further limits the versatility of current systems. This patent addresses these challenges by introducing an innovative electromagnetic actuation system designed to enhance magnetic field gradients and adaptability, enabling more effective control of micro-scale objects.
Technology
The patent introduces an electromagnetic device with a movable magnetic core and optimized geometric design to generate a high-gradient magnetic field. Key innovations include:
1. Robotic Core Design: The magnetic core features a conical tip with a non-zero radius, optimized through finite element analysis to maximize magnetic flux density and gradient. The core can move linearly within an elongated sleeve, allowing dynamic adjustment of the workspace size (e.g., 100–220 mm) and field strength.
2. Magnetic Bridge Integration: Paired electromagnetic devices are connected via a magnetic bridge (e.g., DT4E material), which reduces magnetic resistance and enhances field uniformity by up to 35%.
3. Actuation Strategies: The system employs programmable activation modes for grouped coils, enabling localized gradient enhancement. For example, alternating current directions in opposing coils creates a "zero-field point" for precise control of microagent swarms.
4. Performance Metrics: The system achieves a magnetic flux density of 225 mT and a gradient of 15 T/m in a 100 mm workspace, or 75 mT and 4 T/m in a 160 mm workspace, surpassing conventional systems.
Advantages
- Enhanced Gradient Control: Achieves up to 15 T/m gradients, enabling stronger manipulation forces for microagents.
- Adjustable Workspace: Linear core movement allows workspace resizing (100–300 mm) for diverse applications.
- Energy Efficiency: Optimized coil and core design reduces power consumption while maintaining high field strength.
- Versatile Actuation Modes: Multiple activation strategies (e.g., zero-field point generation) support complex tasks like swarm aggregation.
- Scalability: Modular design supports integration into larger systems for industrial or medical use.
Applications
- Biomedical: Targeted drug delivery, cell transport, and minimally invasive surgery using magnetically guided microrobots.
- Industrial: Microassembly, precision cleaning, and repair in hazardous environments.
- Research: Lab-on-a-chip systems, microfluidics, and material science.
- Robotics: Actuation of soft robots or micro-grippers in confined spaces.
